#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main()
{
    char a;
    while (scanf("%c", &a) != EOF)
    {
        getchar();
        if ((a >= 'A' && a <= 'Z') || (a >= 'a' && a <= 'z'))
        {
            printf("%c is an alphabet.\n", a);
        }
        else
        {
            printf("%c is not an alphabet.\n", a);
        }
    }
    return 0;
}